/*
 * Copyright 1999-2017 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package studio.raptor.sqlparser.ast.expr;

import java.io.Serializable;
import studio.raptor.sqlparser.SQLUtils;
import studio.raptor.sqlparser.ast.SQLExpr;
import studio.raptor.sqlparser.ast.SQLExprImpl;
import studio.raptor.sqlparser.visitor.SQLASTVisitor;

public class SQLBinaryOpExpr extends SQLExprImpl implements Serializable {

  private static final long serialVersionUID = 1L;
  private SQLExpr left;
  private SQLExpr right;
  private SQLBinaryOperator operator;
  private String dbType;

  public SQLBinaryOpExpr() {

  }

  public SQLBinaryOpExpr(String dbType) {
    this.dbType = dbType;
  }

  public SQLBinaryOpExpr(SQLExpr left, SQLBinaryOperator operator, SQLExpr right) {
    this(left, operator, right, null);
  }

  public SQLBinaryOpExpr(SQLExpr left, SQLBinaryOperator operator, SQLExpr right, String dbType) {
    setLeft(left);
    setRight(right);
    this.operator = operator;
    this.dbType = dbType;
  }

  public SQLBinaryOpExpr(SQLExpr left, SQLExpr right, SQLBinaryOperator operator) {

    setLeft(left);
    setRight(right);
    this.operator = operator;
  }

  public String getDbType() {
    return dbType;
  }

  public void setDbType(String dbType) {
    this.dbType = dbType;
  }

  public SQLExpr getLeft() {
    return this.left;
  }

  public void setLeft(SQLExpr left) {
    if (left != null) {
      left.setParent(this);
    }
    this.left = left;
  }

  public SQLExpr getRight() {
    return this.right;
  }

  public void setRight(SQLExpr right) {
    if (right != null) {
      right.setParent(this);
    }
    this.right = right;
  }

  public SQLBinaryOperator getOperator() {
    return this.operator;
  }

  public void setOperator(SQLBinaryOperator operator) {
    this.operator = operator;
  }

  protected void accept0(SQLASTVisitor visitor) {
    if (visitor.visit(this)) {
      acceptChild(visitor, this.left);
      acceptChild(visitor, this.right);
    }

    visitor.endVisit(this);
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((left == null) ? 0 : left.hashCode());
    result = prime * result + ((operator == null) ? 0 : operator.hashCode());
    result = prime * result + ((right == null) ? 0 : right.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (!(obj instanceof SQLBinaryOpExpr)) {
      return false;
    }
    SQLBinaryOpExpr other = (SQLBinaryOpExpr) obj;
    if (left == null) {
      if (other.left != null) {
        return false;
      }
    } else if (!left.equals(other.left)) {
      return false;
    }
    if (operator != other.operator) {
      return false;
    }
    if (right == null) {
      if (other.right != null) {
        return false;
      }
    } else if (!right.equals(other.right)) {
      return false;
    }
    return true;
  }

  public String toString() {
    return SQLUtils.toSQLString(this, getDbType());
  }
}
